A convex lens of focal length 1 meter and a concave lens fo focal length 0.25 meter and kept 0.75 meter apart. A parallel beam of light first passes through the ocnvex lens, then through the concave lens and comes to a focus 0.5m away from the concave lens.

Explanation

False. Applying lens formula for convex lens,
`(1)/(v)-(1)/(u)=(1)/(f)rArr (1)/(v)-(1)/((-prop))=(1)/(1)`
`rArr v=1m`
Applying lens formula for concave lens,
`(1)/(v)-(1)/(u)=(1)/(f)rArr (1)/(v)-(1)/(0.25)=(1)/(0.25)`
`:. (1)/(v)=(1)/(-0.25)+(10)/(0.25)=0rArrv=prop`